Removal of Pb(II) from Aqueous Solution by Sorption on used Tea Leaves

Abstract

Batch sorption study was performed using used black tea leaves (UBTL) as a low-cost adsorbent for the removal of lead (II) from aqueous solutions. Experiments were conducted as a function of contact time, initial metal ion concentration, solution pH and temperature. The sorption of Pb(II) on used tea leaves increases with increase of initial pH of solution upto a certain limit which corresponds to the pH nearly 5. The sorption isotherms follow Langmuir equation better than Freundlich equation. Again the Langmuir equation is more applicable at higher temperatures compared to those at low temperature at all pH. The monolayer sorption capacity decreases with increase in processing temperature but the overall sorbed amount increased with the increase in temperature at all pH. The positive value of estimated heat of sorption suggests the activated sorption. A probable mechanism of the sorption of Pb(II) on used tea leaves was proposed based on the surface charge of used tea leaves and the change of charge of Pb(II) with the pH of solution.

Characterization of Ethyl Violet Adsorption on Used Black Tea Leaves from Aquatic Environment: Kinetic, Isotherm and Thermodynamic Studies

“…The proper utilization of this used black tea leaves (UBTL) would make economical and environmental benefits. Several studies have been reported about the utilization of used black tea leaves as a biosorbent with high efficiency to eliminate organic dyes and heavy metals from water as well as from wastewater [20][21][22][23][24][25][26][27][28][29]. However, no research has been done to investigate the potential of Ethyl violet adsorption on UBTL.…”

Investigation on the Removal of Fe (II) from Wastewater onto Chemically Activated Sawdust

“…In this context, it is very suitable to develop low cost and efficient adsorbent, especially from wastage bio-materials like animal, vegetable and forest by-products for removal of heavy metals from wastewaters [5,6]. It was reported that rice husk [7], olive stone [8], clay minerals [9][10][11][12], used tea leaves [13], wheat straw [14], banana peel [15,16], chitin and chitosan [17] as a good adsorbent, because these are easily available and less polluting substances. It was reported that metals are attached onto the surface of adsorbent in the adsorption process [18][19][20][21][22][23][24][25][26].…”

Surface Modification of the Biowaste for Purification of Wastewater Contaminated with Toxic Heavy Metals—Lead and Cadmium

“…Recently, adsorptions of metals by using bioadsorbents are in progress [4,5]. Different types of industrial and agricultural bio-wastes are investigated as bioadsorbent such as sugarcane bagasse [6], rice husk [7], olive stone [8], orange waste [9], used tea leaves [10], wheat straw [11], sea weeds [12], chitin and chitosan [13]. They are easily available, economically acceptable and chemically less polluting substances often with high affinity and binding capacity of metals.…”